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利用最新钻探的马页1井的井下资料和大量岩心样品的测试分析数据,并结合野外地质调查资料,从富有机质页岩的有机地化、矿物组分、储集特性和裂缝特征等方面,系统地研究了滇东地区马龙区块下寒武统筇竹寺组黑色页岩的储层特征。研究区筇竹寺组黑色页岩有机质丰度较高,TOC含量普遍大于2%;由于筇竹寺组地层较老,黑色页岩的有机质均处于高成熟-过成熟阶段;黑色页岩的矿物组分主要为碎屑矿物、碳酸盐矿物和黏土矿物。脆性矿物含量较高,脆性指数平均值为0.62。黏土矿物主要以伊利石为主,其次为伊蒙混层和绿泥石,高岭石含量较低;该区筇竹寺组页岩的孔、渗较低,孔隙类型复杂多样,主要包括“墨水瓶”孔、板状孔和狭缝型孔。页岩主要发育纳米级中孔,且比表面积和总孔体积偏小,平均值分别为9.18 m2/g和10.38×10-3cm3/g;储层裂缝以高角度缝为主,上部碳质页岩裂缝发育,下部粉砂质页岩裂缝不发育。有机碳含量和脆性矿物含量促进了页岩裂缝的发育;与国内外典型海相页岩储层对比,滇东地区马龙区块筇竹寺组页岩以粉砂质页岩为主,碳质页岩层较薄,而Fort Worth盆地Barnett页岩、焦石坝地区龙马溪组页岩和岑巩区块牛蹄塘组页岩主要为硅质页岩和碳质页岩,筇竹寺组页岩的岩相与这3组海相页岩相比较差;筇竹寺组页岩有机碳含量低于其他3组海相页岩,有机质丰度中等;筇竹寺组页岩脆性矿物含量与龙马溪组页岩相当,稍低于牛蹄塘组页岩,脆性较好;Barnett页岩和龙马溪组页岩无论在储集物性上还是有机质孔隙发育程度上都要优于筇竹寺组页岩和牛蹄塘组页岩,筇竹寺组页岩有机质孔隙主要发育于有机质与黏土的混合物中;筇竹寺组页岩裂缝发育程度低于Barnett页岩、龙马溪组页岩和牛蹄塘组页岩。此外,筇竹寺组页岩含气量低于其他3组海相页岩,但吸附能力较强。
Based on the latest drilling data of Well Ma 1 and the data of a large number of core samples, and combining with field geologic survey data, from the aspects of organic geochemistry, mineral components, reservoir characteristics and fracture characteristics of organic-rich shale, This paper systematically studied the reservoir characteristics of the Lower Cambrian Qiongzhusi black shale in the Malong block of eastern Yunnan. The black shale in Qiongzhusi Formation in the study area has a high abundance of organic matter with a TOC content of more than 2%. Due to the older strata of Qiongzhusi Formation, the organic matter of the black shale is in a high mature-maturity stage. The minerals of black shale The major components are detrital minerals, carbonate minerals and clay minerals. Fragile mineral content is higher, the average brittleness index is 0.62. The main clay minerals are illite, followed by Yimeng mixed layer and chlorite, and the content of kaolinite is relatively low. The pores and infiltration of shale in Qiongzhusi Formation in this area are very low with complex and diverse pore types, including “ Ink bottle ”hole, plate hole and slit type hole. The shale mainly has nanoscale mesopores with a small specific surface area and total pore volume of 9.18 m2 / g and 10.38 × 10-3 cm3 / g, respectively. The fractures of the reservoirs are dominated by high-angle fractures. The upper carbonaceous sheet Rock cracks developed, the lower shale shale fracture is not developed. Organic carbon content and brittle mineral content promote the development of shale fractures. Compared with the typical marine shale reservoirs at home and abroad, the Qiongzhusi shale in the Malong block in the eastern Yunnan region is dominated by silt shale, while the carbonaceous Shale layers are thinner, whereas the Barnett shales in the Fort Worth basin and the Longmaxi shale in the Jiaoshiba area and the Niutitang shale in the Cenheng block mainly consist of siliceous shale and carbonaceous shale, The lithofacies of the rocks are not as good as those of the three marine shales. The content of organic carbon in the shale in Qiongzhusi Formation is lower than that of the other three marine shales, and the organic matter abundance is moderate. The shale lithology, The shale of Longmaxi Formation is quite similar, slightly lower than that of Niutitang Formation, and has better brittleness. Barnett Shale and Longmaxi Formation shale are better than Qiongzhusi Formation in both reservoir properties and organic matter porosity Shale and Niutizang shale, Qiongzhusi shale organic matter mainly in the pores of organic matter and clay mixture; Qiongzhusi shale fracture development is lower than the Barnett shale, Longmaxi shale and Niutizang Group shale. In addition, the Qiongzhusi Formation shale gas content is lower than the other three groups of marine shale, but the adsorption capacity is strong.